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Note 18 - Quarterly Financial Information (amounts in thousands, except per share data) (Tables) | 12 Months Ended
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Dec. 31, 2012
Schedule of Quarterly Financial Information [Table Text Block] |
|  | 2012 Quarters Ended (unaudited) |  |  |  |
|  | March 31 |  |  | June 30 |  |  | September 30 |  |  | December 31 |  |  | Total |
Revenues |  | $ | 98,425 |  |  | $ | 168,709 |  |  | $ | 205,284 |  |  | $ | 158,089 |  |  | $ | 630,507 |
Gross profit |  |  | 1,873 |  |  |  | 15,159 |  |  |  | 14,170 |  |  |  | 16,270 |  |  |  | 47,472 |
Income (loss) before income taxes and earnings attributable to noncontrolling interests |  |  | (3,781 | ) |  |  | 8,652 |  |  |  | 4,915 |  |  |  | 7,347 |  |  |  | 17,133 |
Net income (loss) attributable to Sterling common stockholders |  |  | (7,500 | ) |  |  | 3,287 |  |  |  | 990 |  |  |  | 2,926 |  |  |  | (297 | )
Net income (loss) per share attributable to Sterling common stockholders: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Basic |  | $ | (0.44 | ) |  | $ | 0.15 |  |  | $ | 0.01 |  |  | $ | 0.01 |  |  | $ | (0.26 | )
Diluted |  |  | (0.44 | ) |  |  | 0.15 |  |  |  | 0.01 |  |  |  | 0.01 |  |  |  | (0.26 | )
|  | 2011 Quarters Ended (unaudited) |  |  |  |
|  | March 31 |  |  | June 30 |  |  | September 30 |  |  | December 31 |  |  | Total |
Revenues |  | $ | 99,242 |  |  | $ | 128,498 |  |  | $ | 159,427 |  |  | $ | 113,989 |  |  | $ | 501,156 |
Gross profit |  |  | 7,599 |  |  |  | 13,582 |  |  |  | 14,756 |  |  |  | 3,900 |  |  |  | 39,837 |
Income (loss) before income taxes and earnings attributable to noncontrolling interests |  |  | 1,648 |  |  |  | 7,437 |  |  |  | 7,925 |  |  |  | (68,726 | ) |  |  | (51,716 | )
Net income (loss) attributable to Sterling common stockholders |  |  | 44 |  |  |  | 4,211 |  |  |  | 3,461 |  |  |  | (43,616 | ) |  |  | (35,900 | )
Net income (loss) per share attributable to Sterling common stockholders: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Basic |  | $ | 0.00 |  |  | $ | 0.26 |  |  | $ | 0.21 |  |  | $ | (2.72 | ) |  | $ | (2.24 | )
Diluted |  |  | 0.00 |  |  |  | 0.25 |  |  |  | 0.21 |  |  |  | (2.72 | ) |  |  | (2.24 | )

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- Definition No authoritative reference available. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration